Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8903000f8af9e6…

MALICIOUS

PDF

78.5 KB Created: 2021-10-07 17:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01ee7237c394e34dac966a380a296b86 SHA-1: ab73c9e7f9f818151d019c634ab35e64c3a85840 SHA-256: 7a8903000f8af9e6d6331e75d78a78e45c373639c7da5e07b6158b5862b134da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious content, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. The presence of external URIs and the link farm nature strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.srijonihealinghome.com/fckimages/file/12648608979.pdf In PDF document text
    • http://ankaraeksioglu.com/resimler/files/nasemivejifagenivoxununu.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xotikaxapumifemarariwov.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/75863804407.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/74398065349.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/32722357628.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/natak.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/28635369649.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/90a31e31cd855eabc9b51e1f0eead6e0.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/55463485184.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/35077392798.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/33004913819.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/39189786409.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/22878005204.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210921083804.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/zapakisapivo.pdfIn PDF document text
    • http://stylekd.ru/files/laritorukufubejuzu.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/9119245785.pdfIn PDF document text
    • https://telenovella-bg.com/files/gaborazefubigijojawar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+causes+enlargement+of+spleenPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC93 18220 bytes
SHA-256: 258dd67ea5abc2bd5ad6014418044ccd9528e7b740bd318dec0865b70b89d33b
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10928 bytes
SHA-256: 0e2f2a834771d61b82bda509c7a26523c6ca8c01187f26e6f81c32b33492f9a6
font_02_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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